RAS syndrome

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Human language includes redundancy so that the brain can fill in gaps when something is misheard. Sometimes this redundancy gets in the way of rapid communication, causing people to make an abbreviation. But because there are only so many letters in the alphabet, sometimes these abbrevations can "collide", or have multiple independent meanings. Speakers may disambiguate the meaning by reintroducing a generic term following the abbreviation. The traditional use of trademarks as adjectives encourages this behavior as well. Still, some pedants consider this use of "RAS syndrome", or "redundant abbreviation syndrome syndrome", as poor style.

Examples

AC current
Alternating current, to distinguish from Animal Crossing, Armored Core, Asheron's Call, and Assassin's Creed
ATM machine
Automated teller machine, to distinguish from Asynchronous Transfer Mode
CSS style sheets
Cascading Style Sheets, to distinguish from Content Scramble System. (Compare the other DeCSS.)
FTP protocol
File Transfer Protocol, to distinguish from protest against law enforcement
IP protocol
Internet Protocol, to distinguish from the various exclusive rights that have been conflated under the intellectual property umbrella
LCD display
Liquid crystal display, to distinguish from lowest common denominator
PIN number
Personal identification number, to distinguish from "pin" or from some dialects' pronunciation of "pen"
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